[math-fun] Miss those IBM/DEC blinking lights?

Robert Baruch is building a 32-bit RISC-V processor out of 3.3v MSI logic chips. This cool video describes his circuit board for a single 32-bit register (out of 32 such registers) of this modern RISC architecture. He uses two standard PCIE-style busses & connectors for his sink + 2 source busses. In 1950's/1960's style, the register comes with its own set of LED blinking lights! (BTW, the LED's cost more and take substantially more power than the register itself.) For the cognescenti: I find it curious that he built a full 32-bit register board instead of a *bit slice* of the entire register-cum-ALU a la the PDP-8 or the old AMD bit-slice chips. https://www.youtube.com/watch?v=yLs_NRwu1Y4